Testing the accuracy of your bends and vibrato is a good way to judge how developed you are as a guitarist and a musician.
Learn a double-picking technique Jake E. Lee used to great effect during his time with Ozzy Osbourne.
Wanna get better but are pressed for time? Here's a quick, intensive guitar "workout" that can be completed in 30 minutes.
If you've spent a period of time away from playing, these useful exercises will help rebuild your technique.